Jim,
Yes, not too scientific but a noticable difference. Since you didn't mention
it I assume you didn't have it dyno'd. How about seat of the pants dyno ?
I did correspond with Ken and he doesn't have any flow data either.
I do plan to buy his valves though.
Jim G.
----- Original Message -----
From: "J.C. Hassall" <jhassall@blacksburg.net>
To: toodamnfunky@comcast.net
Cc: "fot" <fot@autox.team.net>
Sent: Thursday, October 28, 2010 11:38:44 AM
Subject: Re: [Fot] TR4 head flow rates
On 10/28/2010 9:56 AM, toodamnfunky@comcast.net wrote:
> FoT,
>
> Does anyone have any TR-4 head flow data. I'm thinking of going to the big
valves
>
> so I decided it's time to get smart on the subject.
> B B
Jim, unfortunately I have no way to measure CFM, but here is some
anecdotal data. B In my TR4's previous build I had an Isky 777 cam,
ported head (1.5" intake all the way to the seat), polished exhausts,
standard valves and dual 40 DCOEs. B At 1000 idle I could easily hold my
hand right at the tail pipe. B I had Isky reduce the duration on the 777
to come on the cam at 3K instead of 3.5K (I think the grind is GM-72,
can find that if you need it) and I used BFE's oversize valves (which
are gas-flowed, and a work of art - I hated to get them dirty) on intake
and exhaust. B Same head and carbs. B Now I can't hold my hand closer than
about 8-10". B At idle (1K) the exhaust will vigorously flap my jeans leg
from 3' away.
This is clearly not scientific but I'm very impressed w/Ken's valves. B
The engine pumps a *lot* more air than with the standard valves. B Ken
may have flow data, I didn't think to ask him at the time.
hth
jim
>
>
> > From TeriAnn's website discussing webers.
>
> "optimum gas speed" for best flow was 325 fps.
>
>
>
> "this might explain a little why lots of times increasing the size of the
inlet valves does
>
> NOTHING for the power and may even be a deterrent."
>
>
>
> I use the mikuni hsr45 smooth bores which flow at 237 CFM.
>
> I'm just trying to put things into some perspective.
>
>
>
> Jim G.
> _______________________________________________
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>
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>
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>
>
>
> B B
--
Jim Hassall
Blacksburg VA
'63 TR4 in autox preparation
99% finished, 90% to go
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